OPEN Acrylic Colors are best used in thin layers. Applications of more than 1/16will result in:
Excessively long drying periods
Persistently soft, higher tack feel
Translucent layers that remain cloudy
For thick applications, regular GOLDEN Acrylic Colors and Mediums are strongly recommended.
Layering OPEN With Faster Drying Acrylic Products
It is best to allow films containing OPEN Gel or Medium to dry fully before applying faster drying layers on top. Since volatile materials in OPEN evaporate slowly, faster drying layers can easily entrap these materials and delay the time when the layers will fully adhere to each other. While ultimately all layers will coalesce and develop full adhesion, quickly interleafing faster and slower drying layers can cause some of those layers to display early adhesion failure if pulled on, as can happen in hard-edge techniques that use masking tape.
Do not apply thick films of faster drying gels on top of applications of OPEN Acrylics, Gel, or Medium without waiting for a minimum of two weeks after being touch dry. This extended period is needed to avoid the volatile materials that might still be evaporating from the underlying materials from causing these faster drying gel applications from remaining cloudy or hazy.